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July Radiology 2005 Answer Key

This patient is a 64 year old male who was found by her family sleeping on the floor. When they aroused her she was lethargic and confused. The following CT scan is shown.

Questions:

1. Describe what you see? Blood around the circle of Willis consistent with a subarachnoid hemorrhage  

          Diagnosis: Subarachnoid hemorrhage

2. Why is a CT scan the preferred diagnostic method for this disease?

     The CT scan is the preferable to MRI because it is more sensitive in detecting hemorrhage in the first 24 hours.

3. What should be done if the CT scan is negative?

     If the CT scan is negative, in light of the history, a lumbar puncture should be performed to look for xanthochroid and or an infectious cause of the patients mental status change.

4. What is the Hunt - Hess grading system for your diagnosis?

       Grade 0 Unruptured aneurysm
       Grade 1 Asymptomatic or mild headache
       Grade 2 Moderate-severe headache, nuchal rigidity, ± cranial
        nerve deficits
       Grade 3 Confusion, lethargy, or mild focal symptoms
       Grade 4 Stupor, ± hemiparesis
       Grade 5 Comatose, ± extensor posturing

Trivia: Ok, I‘m really dating myself but who wrote the song Woodstock? (Notably preformed by Crosby, Stills, Nash and Young)

             Answer:    Joni Mitchell

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